Abstract
Non-centrosymmetric metals with tetragonal structure are characterized by an antisymmetric Rashba-type spin–orbit interaction, which has been predicted to give rise to anomalous spin susceptibility. Our polarized inelastic neutron scattering measurements in the normal phase of the heavy-fermion superconductor CePt3 Si confirm this prediction. We find that for a finite wave vector along the crystallographic a-direction the spin susceptibility χaa is different from χbb by a factor of two. The effect is even larger than in theoretical calculations based on the Hubbard model, and we speculate that this is due to the strong spin–orbit coupling of rare-earth heavy fermions.
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